Longest I've left an orange peel in with my weed is maybe about an hour, then I dry the weed back out immediately after to make sure no mold gets it. It doesn't take long at all for the dry weed to absorb the moisture. I can't wait til next time to do more experiments.... like repeating the process a few times for the weed before smoking it.

I smoked out of an apple a few times.. it was an interesting experience. you could just do that but make the intake hole small, joint sized, and that might work out pretty neat.

rubbing the orange peel's oil onto the papers might work, although could give it a more bitter taste. Def worth a try.